Kim Kardashian arrives at the Metropolitan Museum of Art Costume Institute Gala Benefit celebrating the opening of "Charles James: Beyond Fashion" in Upper Manhattan, New York May 5,
Reuters/Carlo Allegri

Kim Kardashian is reportedly on an "extreme liquid diet" to shed off her excess weight. The 33-year-old reality television star allegedly felt "insecure" and fat standing next to super models Naomi Campbell and Kate Moss at a recent party in Ibiza. Kim and her husband Kanye West attended the star studded birthday party of designer Ricardo Tisci in Ibiza some time back where both these super models were also present.

Kim posted lot of pictures of herself standing next to Kate Moss, Paris Hilton and Naomi on her Instagram account but various sources present at the party revealed to Daily Mail in an exclusive report that Kim was "mortified" standing next to them.

"Kim was mortified by how huge she looked next to the models. She's been raging about it, saying she felt obese and short beside these women who are half as wide, but a foot taller," revealed the source to the website.

Kim tried to hide behind Kanye West while getting clicked. Check out one such picture here.

The mommy to one-year-old North West put on weight at the time of her pregnancy but has also shed quite a lot of weight since then. However, Kim is not very happy with her progress and still feels she needs to lose a lot more weight. The "Keeping up with the Kardashians" star ranted about her "huge butt" on social media some time back and how she is still struggling to lose weight. Read more about it here.

Kim even asked her female fans on Twitter if any of them felt their bodies underwent any changes after pregnancy. She revealed to her fans that her body is not of the same shape anymore and she finds it very difficult to lose weight after baby North West's birth.

Kim is on an "extreme liquid diet" to achieve the weight loss results fast, the source revealed further to the website adding that she is also training hard with Joey Gonzalez from Barry's Bootcamp. The reality star is reportedly very regular with her workouts with Gonzalez.

The wife to rapper Kanye West reportedly lost 50 lb after giving birth to North West and she revealed on social media that she was on Atkins Diet then. The weight issues have however not dampened Kim's confidence and the reality star is coming out with a book on her selfies called "Kim Kardashian Selfish." The book is scheduled to be released in 2015. Read more here.